FILE - In this Jan. 11, 2012, file photo, a man waits to be processed at a Border Patrol detention center in Imperial Beach, Calif. Illegal immigration has slowed in recent years, with the Border Patrol recently recording the fewest arrests in almost 40 years. But many people worry that the Mexican border, the most popular crossing point for newly arriving illegal immigrants, still isn’t secure more than a decade after the Sept. 11, 2001, terrorist attacks. (AP Photo/Gregory Bull, File)